Effect of the cultivation medium composition on Dunaliella tertiolecta sensitivity to potassium dichromate
E.S. Stravinskene, Yu.S. Grigor’ev, T.L. Shashkova, M.A. Subbotin, M.A. Polosukhina
Section: Ecotoxicology
The effect of a model toxicant on the growth of the algae Dunaliella tertiolecta in Goldberg medium, prepared on the
basis of solutions of various sea salt complexes, as well as NaCl alone solution, has been studied. The growth of algae in
the controls was 10–15 times after 48 hours in all variants of media. Potassium dichromate at a concentration of 5 mg/L
had little or no effect on the growth of the test culture in media prepared from the sea salt solutions. Simultaneously, the
same concentration of potassium dichromate completely suppressed the algae growth in NaCl-media. The results of the
chemical analysis of all the studied sea salt solutions showed a ratio of the main ions close to that of natural sea water. All
studied samples of sea salt solutions contained 5 to 8% magnesium and calcium ions, which is a possible explanation for
the lower sensitivity of Dunaliella tertiolecta to potassium dichromate in these media, since the hardness of the medium
affects the bioavailability of toxicants for test organisms.
ISSN 1995-4301
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